Cutting bit



Aug. 6, 1935. T.'s. BRIGHTWELL CUTTING BIT Filed June 5, 1935 M5. i W,

Patented Aug. 6, 1935 PATENT OFFICE..

CUTTING BIT Thaddeus Stephens Brightwcll, Rankin, Pa., as-

signor of one-fourth to William Braddock, Pa.

E., Scholtz,

Application June 5, 1933, Serial No. 674,461

3 Claims.

This invention is a bit for use in sewing machines and the like to cut through cardboard, composition material, light wood or other material for the pulpose of forming cut-out designs,

l advertising announcements or gures of any form.

The invention provides a simple bitwhich may be easily secured in the needle bar of an ordinary sewing machine or associated with any machine that is Capable of rapidly reciprocating the bit 10 and it is driven by the machine to cut through any sheet material for the purpose of forming cut-out designs such as advertising displays, picture puzzles and the like.

The invention is illustrated in the accompanying drawing and will be hereinafter fully set forth and dened.

Figurel is a side elevation of a bit embodying the invention.

Figure 2 is an edge elevation of the same.

Figure 3 is a top plan View of the bit.

Figure 4 is a section on the line '1 4y of Figure 1.

Figure 5 is a view similar to Figure 1 but showing a slight modication.

Figure 6 is a view of the bit shown in Figure 5, taken at a right angle to the viewpoint'of Figure 5.

Figure 7 is a view showing a further modication.

Figure 8 is an edge elevation of the form shown in Figure 7. v

'I'he bit is of course constructed preferably of steel or other metall having the necessary strength and durability, and referring to the drawings in detail, the reference numeral I indicates the upper portion or shank which is of proper form and dimensions to be secured in and fit the needle barof a sewing machine or other like machine to reciprocate the bit. The shank is shown as having a cross sectional rounded contour with a segment cut away to present a nat face 2.

'I'he lower end of the shank in the forms as shown, is tapered and merges into a relatively flat lower portion 3 of rectangular form to provide narrow'sides and broad sides. In the forms as shown in Figures 1 and 2, the lower portion is tapered so that its narrow sides decrease in width toward its free end as shown in Figure 2, and so that the free end is wider across the broad sides 55 mation tends to prevent turning of the bit in the fingers of the user when applying or removing it with respect to a machine.

The portion 3 adjacent to its free end is beveled upwardly and laterally on its broad sides from lines extending obliquely relative to the lon- 5 gitudinal axis of the bit to the free end to provide a cutting edge 4 extended accordingly, as will be apparent upon inspection of Figures l and 2.

The lower portion 3 is highly tempered so that it may be given an extremely ne cutting edge 10 which of course is very essential, andthe edge may be renewed or sharpened as desired.

Due to the particular formation of the portion 3 and the bevel that forms the cutting edge 4, it will be obvious that the bit will readily cut sheet material such as cardboard, composition, woods of light weight or like material, with minimum friction and will provide sufficient clearance for the withdrawal of the bit on its upward stroke. The cutis accomplished without leaving any dust or other residue, as the fibers of the material are not only cut but are separated in the same manner as is accomplished by a pair or" scissors in cutting paper or the like, with the result the bit is particularly adapted for use in inlay work, as parts cut from a piece of wood of one color will frictionally t the places formed by making a like cut in pieces of wood of another color.

In Figure 5 the cutting end 5 of the bit is shown as being relatively thick, with a notch 6 extending 30 upwardly in its extremity, and the outer sides of the cutting end are outwardly ared toward the lower end thereof to provide with the notch, two parallel cutting edges, as will be apparent upon inspection of Figures 5 and 6.

In Figures 7 and 8 the bit is tapered to a cutting edge l from two opposite sides of the intermediate portion 8, While the meeting sides are expanded or flared thereby producing a chisel edge which is disposed at a right angle to the longitudinal axis of the bit. It is thought from the foregoing description that the advantages and novel features of my invention will be readily apparent.

I desireA it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

Having described the invention, I claimz' 1. A bit to be reciprocated for cutting material such as cardboard or the like to sever parts therefrom to form cut-out designs, and said bit comprising a shank shaped to t a machine to reciprocate the bit, a relatively flat lower portion formed on the shank and tapered toward its free end, so that the latter is Wider across the broad sides of said at portion than the intermediate diameter thereof, and said flat portion being beveled on its broad sides and terminating in a cutting edge extending obliquely to the longitudinal axis of the bit.

2. A bit to be reciprocated for cutting material such as cardboard or the like to sever parts therefrom to form cut-out designs, and said bit comprising a shank shaped to t a machine to reciprocate the bit, a relatively flat lower portion formed on the shank and tapered toward its free end so that the latter is Wider across the broad sides of said flat portion than the intermediate diameter thereof, and said flat portion adjacent to its free end being beveled at an upward inclination on its broad sides from lines extending obliquely relative to the axis of the bit to the free end to provide a cutting edge extending accordingly.

3. A bit to be reciprocated for cutting material suchas cardboard and the like to sever parts therefrom to form cut-out designs, and said bit oomprising a shank shaped to t a machine to reciprocate the bit, a relatively fiat lower portion tapered so that its narrow sides decrease in Width toward its free end and so that the latter is wider across the broad sides than the intermediate diameter thereof, and said flat portion adjacent to its free end being beveled at an upward inclination on its broad sides from lines extending obliquely relative to the axis of the bit, to the free end to provide a cutting edge extending accordingly.

THADDEUS STEPHENS BRIGHTWELL. 

